Do we need three by-laws for the same work on different units?

We supply and install secondary windows for houses and units. On occasion when we provide a quote to clients in Strata, the strata requests that a bylaw be made in order to have our windows systems installed.

In one complex the client was asked to pay $2600 to create a bylaw.  He proceeded and we did the job. We had two other owners waiting on the outcome and when they subsequently applied to do the works they were told they would each have to pay $2600 for a bylaw. 

 My questions are as follows.

1. Once a bylaw is created can everyone in the complex rely on this bylaw?
2. Can we draw up a bylaw and offer it to clients to submit to their strata.  Therefore we absorb the cost of the bylaw drafting and make it easy for strata to approve.  I spoke to the dept of fair trade who said that anyone can prepare a bylaw and it only costs about $100 to submit to the dept.
3. Do you know someone who could help us prepare the bylaw so it is worded adequately to satisfy strata but broadly enough to suit any complex / owner